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News/GRPO is Secretly a Process Reward Model
arxiv
PublishedMay 29, 2026 at 4:00 AM
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GRPO is Secretly a Process Reward Model

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Publisher summary· verbatim

arXiv:2509.21154v4 Announce Type: replace-cross Abstract: Process reward models (PRMs) allow for fine-grained credit assignment in reinforcement learning (RL), and seemingly contrast with outcome reward models (ORMs), which assign a single reward to an entire trajectory. However, we provide theoreti

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